diff --git a/src/app.module.ts b/src/app.module.ts
index 30a2699..9c55988 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -13,6 +13,7 @@ import { BusinessAttributeValuesModule } from './modules/business-attribute-valu
 import { BookingsModule } from './modules/bookings/bookings.module';
 import { BusinessRegistrationRequestsModule } from './modules/business-registration-requests/business-registration-requests.module';
 import { BusinessServiceRequestsModule } from './modules/business-service-requests/business-service-requests.module';
+import { BusinessServiceClassesModule } from './modules/business-service-classes/business-service-classes.module';
 import { AuthModule } from './modules/auth/auth.module';
 import { UsersModule } from './modules/users/users.module';
 
@@ -29,6 +30,7 @@ import { UsersModule } from './modules/users/users.module';
     BookingsModule,
     BusinessRegistrationRequestsModule,
     BusinessServiceRequestsModule,
+    BusinessServiceClassesModule,
     AuthModule,
     UsersModule,
   ],
diff --git a/src/common/utils/business-cascade.util.ts b/src/common/utils/business-cascade.util.ts
index 4a42576..46df1a7 100644
--- a/src/common/utils/business-cascade.util.ts
+++ b/src/common/utils/business-cascade.util.ts
@@ -6,6 +6,7 @@ import { BusinessAttributeValueEntity } from '../../entities/business-attribute-
 import { BusinessCategoryEntity } from '../../entities/business-category.entity';
 import { BusinessServiceRequestEntity } from '../../entities/business-service-request.entity';
 import { BusinessServiceEntity } from '../../entities/business-service.entity';
+import { BusinessServiceClassEntity } from '../../entities/business-service-class.entity';
 import { BusinessImageEntity } from '../../entities/business-image.entity';
 import { BusinessAvailabilitySlotEntity } from '../../entities/business-availability-slot.entity';
 import { BusinessEntity } from '../../entities/business.entity';
@@ -20,6 +21,7 @@ export async function deleteBusinessCascade(
   await manager.delete(BusinessServiceRequestEntity, { businessId });
   await manager.delete(BusinessAvailabilitySlotEntity, { businessId });
   await manager.delete(BusinessServiceEntity, { businessId });
+  await manager.delete(BusinessServiceClassEntity, { businessId });
   await manager.delete(BusinessAttributeValueEntity, { businessId });
   await manager.delete(BusinessImageEntity, { businessId });
 
diff --git a/src/database/migrations/1789046000000-CreateBusinessServiceClasses.ts b/src/database/migrations/1789046000000-CreateBusinessServiceClasses.ts
new file mode 100644
index 0000000..ae9866b
--- /dev/null
+++ b/src/database/migrations/1789046000000-CreateBusinessServiceClasses.ts
@@ -0,0 +1,76 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class CreateBusinessServiceClasses1789046000000
+  implements MigrationInterface
+{
+  name = 'CreateBusinessServiceClasses1789046000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      CREATE TABLE IF NOT EXISTS "business_service_classes" (
+        "id" uuid NOT NULL DEFAULT gen_random_uuid(),
+        "businessId" uuid NOT NULL,
+        "title" varchar(120) NOT NULL,
+        "description" varchar(500),
+        "sortOrder" integer NOT NULL DEFAULT 0,
+        "isActive" boolean NOT NULL DEFAULT true,
+        "createdAt" TIMESTAMP NOT NULL DEFAULT now(),
+        "updatedAt" TIMESTAMP NOT NULL DEFAULT now(),
+        CONSTRAINT "PK_business_service_classes" PRIMARY KEY ("id"),
+        CONSTRAINT "UQ_business_service_class_title" UNIQUE ("businessId", "title"),
+        CONSTRAINT "FK_service_class_business" FOREIGN KEY ("businessId")
+          REFERENCES "businesses"("id") ON DELETE CASCADE
+      )
+    `);
+
+    await queryRunner.query(`
+      CREATE TABLE IF NOT EXISTS "business_service_class_prices" (
+        "id" uuid NOT NULL DEFAULT gen_random_uuid(),
+        "businessServiceId" uuid NOT NULL,
+        "classId" uuid NOT NULL,
+        "price" numeric(12,2) NOT NULL,
+        "durationMinutes" integer,
+        "isActive" boolean NOT NULL DEFAULT true,
+        "createdAt" TIMESTAMP NOT NULL DEFAULT now(),
+        "updatedAt" TIMESTAMP NOT NULL DEFAULT now(),
+        CONSTRAINT "PK_business_service_class_prices" PRIMARY KEY ("id"),
+        CONSTRAINT "UQ_business_service_class_price" UNIQUE ("businessServiceId", "classId"),
+        CONSTRAINT "FK_class_price_service" FOREIGN KEY ("businessServiceId")
+          REFERENCES "business_services"("id") ON DELETE CASCADE,
+        CONSTRAINT "FK_class_price_class" FOREIGN KEY ("classId")
+          REFERENCES "business_service_classes"("id") ON DELETE CASCADE
+      )
+    `);
+
+    await queryRunner.query(`
+      ALTER TABLE "bookings"
+      ADD COLUMN IF NOT EXISTS "serviceClassId" uuid
+    `);
+
+    await queryRunner.query(`
+      DO $$
+      BEGIN
+        IF NOT EXISTS (
+          SELECT 1 FROM pg_constraint WHERE conname = 'FK_booking_service_class'
+        ) THEN
+          ALTER TABLE "bookings"
+          ADD CONSTRAINT "FK_booking_service_class"
+          FOREIGN KEY ("serviceClassId")
+          REFERENCES "business_service_classes"("id")
+          ON DELETE RESTRICT;
+        END IF;
+      END $$;
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE "bookings" DROP CONSTRAINT IF EXISTS "FK_booking_service_class"
+    `);
+    await queryRunner.query(`
+      ALTER TABLE "bookings" DROP COLUMN IF EXISTS "serviceClassId"
+    `);
+    await queryRunner.query(`DROP TABLE IF EXISTS "business_service_class_prices"`);
+    await queryRunner.query(`DROP TABLE IF EXISTS "business_service_classes"`);
+  }
+}
diff --git a/src/database/migrations/1789046100000-AddBusinessServiceClassesEnabled.ts b/src/database/migrations/1789046100000-AddBusinessServiceClassesEnabled.ts
new file mode 100644
index 0000000..234272a
--- /dev/null
+++ b/src/database/migrations/1789046100000-AddBusinessServiceClassesEnabled.ts
@@ -0,0 +1,20 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class AddBusinessServiceClassesEnabled1789046100000
+  implements MigrationInterface
+{
+  name = 'AddBusinessServiceClassesEnabled1789046100000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE "businesses"
+      ADD COLUMN IF NOT EXISTS "serviceClassesEnabled" boolean NOT NULL DEFAULT false
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE "businesses" DROP COLUMN IF EXISTS "serviceClassesEnabled"
+    `);
+  }
+}
diff --git a/src/database/migrations/1789046200000-AddBookingGroupId.ts b/src/database/migrations/1789046200000-AddBookingGroupId.ts
new file mode 100644
index 0000000..1b402be
--- /dev/null
+++ b/src/database/migrations/1789046200000-AddBookingGroupId.ts
@@ -0,0 +1,24 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class AddBookingGroupId1789046200000 implements MigrationInterface {
+  name = 'AddBookingGroupId1789046200000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE "bookings"
+      ADD COLUMN IF NOT EXISTS "bookingGroupId" uuid
+    `);
+    await queryRunner.query(`
+      CREATE INDEX IF NOT EXISTS "IDX_booking_group"
+      ON "bookings" ("bookingGroupId")
+      WHERE "bookingGroupId" IS NOT NULL
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`DROP INDEX IF EXISTS "IDX_booking_group"`);
+    await queryRunner.query(`
+      ALTER TABLE "bookings" DROP COLUMN IF EXISTS "bookingGroupId"
+    `);
+  }
+}
diff --git a/src/entities/booking.entity.ts b/src/entities/booking.entity.ts
index e39128e..e98e837 100644
--- a/src/entities/booking.entity.ts
+++ b/src/entities/booking.entity.ts
@@ -9,6 +9,7 @@ import {
 } from 'typeorm';
 import { BusinessEntity } from './business.entity';
 import { BusinessServiceEntity } from './business-service.entity';
+import { BusinessServiceClassEntity } from './business-service-class.entity';
 import { UserEntity } from './user.entity';
 
 export enum BookingStatus {
@@ -46,6 +47,16 @@ export class BookingEntity {
   @Column('uuid')
   businessServiceId!: string;
 
+  @ManyToOne(() => BusinessServiceClassEntity, { nullable: true, onDelete: 'RESTRICT' })
+  @JoinColumn({ name: 'serviceClassId' })
+  serviceClass!: BusinessServiceClassEntity | null;
+
+  @Column({ type: 'uuid', nullable: true })
+  serviceClassId!: string | null;
+
+  @Column({ type: 'uuid', nullable: true })
+  bookingGroupId!: string | null;
+
   @Column({ type: 'timestamptz' })
   scheduledAt!: Date;
 
diff --git a/src/entities/business-service-class-price.entity.ts b/src/entities/business-service-class-price.entity.ts
new file mode 100644
index 0000000..1d67e26
--- /dev/null
+++ b/src/entities/business-service-class-price.entity.ts
@@ -0,0 +1,52 @@
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  JoinColumn,
+  ManyToOne,
+  PrimaryGeneratedColumn,
+  Unique,
+  UpdateDateColumn,
+} from 'typeorm';
+import { BusinessServiceClassEntity } from './business-service-class.entity';
+import { BusinessServiceEntity } from './business-service.entity';
+
+@Entity('business_service_class_prices')
+@Unique('UQ_business_service_class_price', ['businessServiceId', 'classId'])
+export class BusinessServiceClassPriceEntity {
+  @PrimaryGeneratedColumn('uuid')
+  id!: string;
+
+  @ManyToOne(() => BusinessServiceEntity, (service) => service.classPrices, {
+    onDelete: 'CASCADE',
+  })
+  @JoinColumn({ name: 'businessServiceId' })
+  businessService!: BusinessServiceEntity;
+
+  @Column('uuid')
+  businessServiceId!: string;
+
+  @ManyToOne(() => BusinessServiceClassEntity, (serviceClass) => serviceClass.classPrices, {
+    onDelete: 'CASCADE',
+  })
+  @JoinColumn({ name: 'classId' })
+  serviceClass!: BusinessServiceClassEntity;
+
+  @Column('uuid')
+  classId!: string;
+
+  @Column({ type: 'numeric', precision: 12, scale: 2 })
+  price!: string;
+
+  @Column({ type: 'int', nullable: true })
+  durationMinutes!: number | null;
+
+  @Column({ default: true })
+  isActive!: boolean;
+
+  @CreateDateColumn()
+  createdAt!: Date;
+
+  @UpdateDateColumn()
+  updatedAt!: Date;
+}
diff --git a/src/entities/business-service-class.entity.ts b/src/entities/business-service-class.entity.ts
new file mode 100644
index 0000000..b96caf2
--- /dev/null
+++ b/src/entities/business-service-class.entity.ts
@@ -0,0 +1,50 @@
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  JoinColumn,
+  ManyToOne,
+  OneToMany,
+  PrimaryGeneratedColumn,
+  Unique,
+  UpdateDateColumn,
+} from 'typeorm';
+import { BusinessEntity } from './business.entity';
+import { BusinessServiceClassPriceEntity } from './business-service-class-price.entity';
+
+@Entity('business_service_classes')
+@Unique('UQ_business_service_class_title', ['businessId', 'title'])
+export class BusinessServiceClassEntity {
+  @PrimaryGeneratedColumn('uuid')
+  id!: string;
+
+  @ManyToOne(() => BusinessEntity, (business) => business.serviceClasses, {
+    onDelete: 'CASCADE',
+  })
+  @JoinColumn({ name: 'businessId' })
+  business!: BusinessEntity;
+
+  @Column('uuid')
+  businessId!: string;
+
+  @Column({ length: 120 })
+  title!: string;
+
+  @Column({ type: 'varchar', nullable: true, length: 500 })
+  description!: string | null;
+
+  @Column({ type: 'int', default: 0 })
+  sortOrder!: number;
+
+  @Column({ default: true })
+  isActive!: boolean;
+
+  @OneToMany(() => BusinessServiceClassPriceEntity, (price) => price.serviceClass)
+  classPrices!: BusinessServiceClassPriceEntity[];
+
+  @CreateDateColumn()
+  createdAt!: Date;
+
+  @UpdateDateColumn()
+  updatedAt!: Date;
+}
diff --git a/src/entities/business-service.entity.ts b/src/entities/business-service.entity.ts
index 1a992aa..4fbad31 100644
--- a/src/entities/business-service.entity.ts
+++ b/src/entities/business-service.entity.ts
@@ -10,6 +10,7 @@ import {
   UpdateDateColumn,
 } from 'typeorm';
 import { BookingEntity } from './booking.entity';
+import { BusinessServiceClassPriceEntity } from './business-service-class-price.entity';
 import { BusinessEntity } from './business.entity';
 import { ServiceTemplateEntity } from './service-template.entity';
 
@@ -49,6 +50,9 @@ export class BusinessServiceEntity {
   @OneToMany(() => BookingEntity, (booking) => booking.businessService)
   bookings!: BookingEntity[];
 
+  @OneToMany(() => BusinessServiceClassPriceEntity, (classPrice) => classPrice.businessService)
+  classPrices!: BusinessServiceClassPriceEntity[];
+
   @CreateDateColumn()
   createdAt!: Date;
 
diff --git a/src/entities/business.entity.ts b/src/entities/business.entity.ts
index 0b1705c..2cbfca6 100644
--- a/src/entities/business.entity.ts
+++ b/src/entities/business.entity.ts
@@ -14,6 +14,7 @@ import { BusinessCategoryEntity } from './business-category.entity';
 import { BusinessImageEntity } from './business-image.entity';
 import { BusinessAvailabilitySlotEntity } from './business-availability-slot.entity';
 import { BusinessServiceEntity } from './business-service.entity';
+import { BusinessServiceClassEntity } from './business-service-class.entity';
 import { UserEntity } from './user.entity';
 
 @Entity('businesses')
@@ -45,6 +46,9 @@ export class BusinessEntity {
   @Column({ default: true })
   isActive!: boolean;
 
+  @Column({ default: false })
+  serviceClassesEnabled!: boolean;
+
   @ManyToOne(() => BusinessCategoryEntity, (category) => category.businesses, {
     onDelete: 'RESTRICT',
   })
@@ -72,6 +76,9 @@ export class BusinessEntity {
   @OneToMany(() => BusinessServiceEntity, (service) => service.business)
   services!: BusinessServiceEntity[];
 
+  @OneToMany(() => BusinessServiceClassEntity, (serviceClass) => serviceClass.business)
+  serviceClasses!: BusinessServiceClassEntity[];
+
   @OneToMany(() => BusinessAttributeValueEntity, (attr) => attr.business)
   attributes!: BusinessAttributeValueEntity[];
 
diff --git a/src/modules/bookings/bookings.controller.ts b/src/modules/bookings/bookings.controller.ts
index 4543d90..dfebe3e 100644
--- a/src/modules/bookings/bookings.controller.ts
+++ b/src/modules/bookings/bookings.controller.ts
@@ -19,6 +19,7 @@ import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
 import { RolesGuard } from '../auth/guards/roles.guard';
 import { BookingsService } from './bookings.service';
 import { CreateBookingDto } from './dto/create-booking.dto';
+import { CreateBookingBatchDto } from './dto/create-booking-batch.dto';
 import { UpdateBookingDto } from './dto/update-booking.dto';
 
 @Controller('bookings')
@@ -28,10 +29,20 @@ export class BookingsController {
   @Get('available-slots')
   getAvailableSlots(
     @Query('businessId') businessId: string,
-    @Query('businessServiceId') businessServiceId: string,
     @Query('date') date: string,
+    @Query('businessServiceId') businessServiceId?: string,
+    @Query('businessServiceIds') businessServiceIds?: string,
+    @Query('serviceClassId') serviceClassId?: string,
   ) {
-    return this.service.getAvailableSlots(businessId, businessServiceId, date);
+    const ids = businessServiceIds
+      ? businessServiceIds.split(',').map((id) => id.trim()).filter(Boolean)
+      : undefined;
+
+    return this.service.getAvailableSlots(businessId, date, {
+      businessServiceId,
+      businessServiceIds: ids,
+      serviceClassId,
+    });
   }
 
   @Get()
@@ -71,6 +82,16 @@ export class BookingsController {
     return this.service.create(payload, user);
   }
 
+  @Post('batch')
+  @UseGuards(JwtAuthGuard, RolesGuard)
+  @Roles(UserRole.ADMIN, UserRole.BUSINESS_OWNER, UserRole.CUSTOMER)
+  createBatch(
+    @Body() payload: CreateBookingBatchDto,
+    @CurrentUser() user: AuthUser,
+  ): Promise<BookingEntity[]> {
+    return this.service.createBatch(payload, user);
+  }
+
   @Patch(':id')
   @UseGuards(JwtAuthGuard, RolesGuard)
   @Roles(UserRole.ADMIN, UserRole.BUSINESS_OWNER)
diff --git a/src/modules/bookings/bookings.module.ts b/src/modules/bookings/bookings.module.ts
index 8bde5cf..c2db3b4 100644
--- a/src/modules/bookings/bookings.module.ts
+++ b/src/modules/bookings/bookings.module.ts
@@ -2,6 +2,8 @@ import { Module } from '@nestjs/common';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { BookingEntity } from '../../entities/booking.entity';
 import { BusinessAvailabilitySlotEntity } from '../../entities/business-availability-slot.entity';
+import { BusinessServiceClassPriceEntity } from '../../entities/business-service-class-price.entity';
+import { BusinessServiceClassEntity } from '../../entities/business-service-class.entity';
 import { BusinessServiceEntity } from '../../entities/business-service.entity';
 import { BusinessEntity } from '../../entities/business.entity';
 import { ServiceTemplateEntity } from '../../entities/service-template.entity';
@@ -18,6 +20,8 @@ import { BookingsService } from './bookings.service';
       BusinessEntity,
       BusinessServiceEntity,
       BusinessAvailabilitySlotEntity,
+      BusinessServiceClassEntity,
+      BusinessServiceClassPriceEntity,
       ServiceTemplateEntity,
     ]),
     AuthModule,
diff --git a/src/modules/bookings/bookings.service.ts b/src/modules/bookings/bookings.service.ts
index cca4d31..974d80a 100644
--- a/src/modules/bookings/bookings.service.ts
+++ b/src/modules/bookings/bookings.service.ts
@@ -6,7 +6,8 @@ import {
 } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
 import { InjectRepository } from '@nestjs/typeorm';
-import { Repository } from 'typeorm';
+import { randomUUID } from 'crypto';
+import { In, Repository } from 'typeorm';
 import {
   generateAvailableSlotStarts,
   parseGregorianYmd,
@@ -17,11 +18,14 @@ import {
 } from '../../common/utils/booking-schedule.util';
 import { BookingEntity, BookingStatus } from '../../entities/booking.entity';
 import { BusinessAvailabilitySlotEntity } from '../../entities/business-availability-slot.entity';
+import { BusinessServiceClassPriceEntity } from '../../entities/business-service-class-price.entity';
+import { BusinessServiceClassEntity } from '../../entities/business-service-class.entity';
 import { BusinessServiceEntity } from '../../entities/business-service.entity';
 import { BusinessEntity } from '../../entities/business.entity';
 import { UserEntity, UserRole } from '../../entities/user.entity';
 import { AuthUser } from '../auth/auth.types';
 import { CreateBookingDto } from './dto/create-booking.dto';
+import { CreateBookingBatchDto } from './dto/create-booking-batch.dto';
 import { UpdateBookingDto } from './dto/update-booking.dto';
 
 type FindAllFilters = {
@@ -47,6 +51,10 @@ export class BookingsService {
     private readonly businessServiceRepo: Repository<BusinessServiceEntity>,
     @InjectRepository(BusinessAvailabilitySlotEntity)
     private readonly availabilityRepo: Repository<BusinessAvailabilitySlotEntity>,
+    @InjectRepository(BusinessServiceClassEntity)
+    private readonly serviceClassRepo: Repository<BusinessServiceClassEntity>,
+    @InjectRepository(BusinessServiceClassPriceEntity)
+    private readonly classPriceRepo: Repository<BusinessServiceClassPriceEntity>,
   ) {
     const raw = this.config.get<string | undefined>('BOOKING_MIN_LEAD_MINUTES');
     const parsed = raw !== undefined ? Number.parseInt(String(raw), 10) : NaN;
@@ -63,6 +71,7 @@ export class BookingsService {
       .leftJoinAndSelect('b.business', 'business')
       .leftJoinAndSelect('b.businessService', 'businessService')
       .leftJoinAndSelect('businessService.serviceTemplate', 'template')
+      .leftJoinAndSelect('b.serviceClass', 'serviceClass')
       .orderBy('b.scheduledAt', 'ASC');
 
     if (actor?.role === UserRole.CUSTOMER) {
@@ -108,6 +117,7 @@ export class BookingsService {
         customer: true,
         business: true,
         businessService: { serviceTemplate: true },
+        serviceClass: true,
       },
     });
     if (!row) {
@@ -151,21 +161,21 @@ export class BookingsService {
     }
 
     const scheduledAt = this.parseScheduledAt(dto.scheduledAt);
-    const durationMinutes = resolveServiceDurationMinutes(
-      businessService.durationMinutes,
-      businessService.serviceTemplate?.defaultDurationMinutes,
+    const pricing = await this.resolveBookingPricing(
+      businessService,
+      dto.serviceClassId ?? null,
     );
     await this.assertSchedulableSlot({
       businessId: dto.businessId,
-      businessServiceId: dto.businessServiceId,
       scheduledAt,
-      durationMinutes,
+      durationMinutes: pricing.durationMinutes,
     });
 
     const entity = this.repo.create({
       customerId: dto.customerId,
       businessId: dto.businessId,
       businessServiceId: dto.businessServiceId,
+      serviceClassId: pricing.serviceClassId,
       scheduledAt,
       note: dto.note ?? null,
       status: BookingStatus.PENDING,
@@ -174,6 +184,93 @@ export class BookingsService {
     return this.repo.save(entity);
   }
 
+  async createBatch(
+    dto: CreateBookingBatchDto,
+    actor?: AuthUser,
+  ): Promise<BookingEntity[]> {
+    if (actor && dto.customerId !== actor.id) {
+      throw new ForbiddenException('You can only book for yourself');
+    }
+
+    const customer = await this.userRepo.findOne({
+      where: { id: dto.customerId },
+    });
+    if (!customer) {
+      throw new NotFoundException('User not found');
+    }
+
+    const business = await this.businessRepo.findOne({
+      where: { id: dto.businessId },
+    });
+    if (!business) {
+      throw new NotFoundException('Business not found');
+    }
+
+    const serviceIds = [
+      ...new Set(dto.items.map((item) => item.businessServiceId)),
+    ];
+    if (serviceIds.length !== dto.items.length) {
+      throw new BadRequestException('Duplicate services in booking batch');
+    }
+
+    const scheduledAt = this.parseScheduledAt(dto.scheduledAt);
+    const serviceClassId = dto.serviceClassId ?? null;
+
+    const resolvedItems: Array<{
+      businessService: BusinessServiceEntity;
+      serviceClassId: string | null;
+      durationMinutes: number;
+    }> = [];
+
+    let totalDurationMinutes = 0;
+    for (const serviceId of serviceIds) {
+      const businessService = await this.businessServiceRepo.findOne({
+        where: { id: serviceId, businessId: dto.businessId, isActive: true },
+        relations: { serviceTemplate: true },
+      });
+      if (!businessService) {
+        throw new NotFoundException(
+          `Business service ${serviceId} not found or inactive`,
+        );
+      }
+
+      const pricing = await this.resolveBookingPricing(
+        businessService,
+        serviceClassId,
+      );
+      resolvedItems.push({
+        businessService,
+        serviceClassId: pricing.serviceClassId,
+        durationMinutes: pricing.durationMinutes,
+      });
+      totalDurationMinutes += pricing.durationMinutes;
+    }
+
+    await this.assertSchedulableSlot({
+      businessId: dto.businessId,
+      scheduledAt,
+      durationMinutes: totalDurationMinutes,
+    });
+
+    const bookingGroupId = serviceIds.length > 1 ? randomUUID() : null;
+    const note = dto.note ?? null;
+
+    const entities = resolvedItems.map(({ businessService, serviceClassId: classId }) =>
+      this.repo.create({
+        customerId: dto.customerId,
+        businessId: dto.businessId,
+        businessServiceId: businessService.id,
+        serviceClassId: classId,
+        bookingGroupId,
+        scheduledAt,
+        note,
+        status: BookingStatus.PENDING,
+      }),
+    );
+
+    return this.repo.save(entities);
+  }
+
   async update(
     id: string,
     dto: UpdateBookingDto,
@@ -185,18 +282,21 @@ export class BookingsService {
 
     if (dto.scheduledAt !== undefined) {
       const scheduledAt = this.parseScheduledAt(dto.scheduledAt);
-      const durationMinutes = resolveServiceDurationMinutes(
-        row.businessService?.durationMinutes,
-        row.businessService?.serviceTemplate?.defaultDurationMinutes,
-      );
+      const durationMinutes = await this.resolveGroupDuration(row);
       await this.assertSchedulableSlot({
         businessId: row.businessId,
-        businessServiceId: row.businessServiceId,
         scheduledAt,
         durationMinutes,
         excludeBookingId: row.id,
+        excludeBookingGroupId: row.bookingGroupId ?? undefined,
       });
       row.scheduledAt = scheduledAt;
+      if (row.bookingGroupId) {
+        await this.repo.update(
+          { bookingGroupId: row.bookingGroupId },
+          { scheduledAt },
+        );
+      }
     }
 
     if (dto.status !== undefined) {
@@ -240,9 +340,13 @@ export class BookingsService {
 
   async getAvailableSlots(
     businessId: string,
-    businessServiceId: string,
     dateYmd: string,
-  ): Promise<{ date: string; slots: string[] }> {
+    options: {
+      businessServiceId?: string;
+      businessServiceIds?: string[];
+      serviceClassId?: string;
+    },
+  ): Promise<{ date: string; slots: string[]; totalDurationMinutes: number }> {
     parseGregorianYmd(dateYmd);
 
     const business = await this.businessRepo.findOne({
@@ -252,32 +356,49 @@ export class BookingsService {
       throw new NotFoundException('Business not found or inactive');
     }
 
-    const businessService = await this.businessServiceRepo.findOne({
-      where: { id: businessServiceId, businessId, isActive: true },
-      relations: { serviceTemplate: true },
-    });
-    if (!businessService) {
-      throw new NotFoundException('Business service not found or inactive');
+    const serviceIds =
+      options.businessServiceIds?.length
+        ? options.businessServiceIds
+        : options.businessServiceId
+          ? [options.businessServiceId]
+          : [];
+
+    if (!serviceIds.length) {
+      throw new BadRequestException('At least one business service is required');
     }
 
-    const durationMinutes = resolveServiceDurationMinutes(
-      businessService.durationMinutes,
-      businessService.serviceTemplate?.defaultDurationMinutes,
-    );
+    const serviceClassId = options.serviceClassId ?? null;
+    let totalDurationMinutes = 0;
+
+    for (const serviceId of serviceIds) {
+      const businessService = await this.businessServiceRepo.findOne({
+        where: { id: serviceId, businessId, isActive: true },
+        relations: { serviceTemplate: true },
+      });
+      if (!businessService) {
+        throw new NotFoundException('Business service not found or inactive');
+      }
+
+      const pricing = await this.resolveBookingPricing(
+        businessService,
+        serviceClassId,
+      );
+      totalDurationMinutes += pricing.durationMinutes;
+    }
 
     const windows = await this.loadAvailabilityWindows(businessId);
     const busy = await this.loadBusyIntervals(businessId, dateYmd);
 
     const slots = generateAvailableSlotStarts({
       dateYmd,
-      durationMinutes,
+      durationMinutes: totalDurationMinutes,
       leadMinutes: this.minLeadMinutes,
       slotStepMinutes: 15,
       windows,
       busy,
     });
 
-    return { date: dateYmd, slots };
+    return { date: dateYmd, slots, totalDurationMinutes };
   }
 
   private async loadAvailabilityWindows(
@@ -294,11 +415,20 @@ export class BookingsService {
   private async loadBusyIntervals(
     businessId: string,
     dateYmd: string,
-    excludeBookingId?: string,
+    options?: { excludeBookingId?: string; excludeBookingGroupId?: string },
   ): Promise<BusyInterval[]> {
     const dayStart = new Date(`${dateYmd}T00:00:00+03:30`);
     const dayEnd = new Date(`${dateYmd}T23:59:59+03:30`);
 
+    let excludeGroupId = options?.excludeBookingGroupId ?? null;
+    if (options?.excludeBookingId && !excludeGroupId) {
+      const excluded = await this.repo.findOne({
+        where: { id: options.excludeBookingId },
+        select: ['id', 'bookingGroupId'],
+      });
+      excludeGroupId = excluded?.bookingGroupId ?? null;
+    }
+
     const qb = this.repo
       .createQueryBuilder('b')
       .leftJoinAndSelect('b.businessService', 'bs')
@@ -310,34 +440,202 @@ export class BookingsService {
       .andWhere('b.scheduledAt >= :dayStart', { dayStart })
       .andWhere('b.scheduledAt <= :dayEnd', { dayEnd });
 
-    if (excludeBookingId) {
-      qb.andWhere('b.id != :excludeBookingId', { excludeBookingId });
+    if (options?.excludeBookingId && !excludeGroupId) {
+      qb.andWhere('b.id != :excludeBookingId', {
+        excludeBookingId: options.excludeBookingId,
+      });
+    }
+    if (excludeGroupId) {
+      qb.andWhere('b.bookingGroupId IS NULL OR b.bookingGroupId != :excludeGroupId', {
+        excludeGroupId,
+      });
     }
 
     const bookings = await qb.getMany();
+    const durations = await Promise.all(
+      bookings.map((b) => this.resolveBookingDuration(b)),
+    );
 
-    return bookings.map((b) => {
-      const duration = resolveServiceDurationMinutes(
-        b.businessService?.durationMinutes,
-        b.businessService?.serviceTemplate?.defaultDurationMinutes,
-      );
-      const startMs = b.scheduledAt.getTime();
-      return {
-        startMs,
-        endMs: startMs + duration * 60 * 1000,
-      };
+    const groupTotals = new Map<
+      string,
+      { startMs: number; totalDuration: number }
+    >();
+    const singles: BusyInterval[] = [];
+
+    for (const [index, booking] of bookings.entries()) {
+      const duration = durations[index] ?? 30;
+      const startMs = booking.scheduledAt.getTime();
+
+      if (booking.bookingGroupId) {
+        const key = `${booking.bookingGroupId}:${startMs}`;
+        const existing = groupTotals.get(key);
+        if (existing) {
+          existing.totalDuration += duration;
+        } else {
+          groupTotals.set(key, { startMs, totalDuration: duration });
+        }
+      } else {
+        singles.push({
+          startMs,
+          endMs: startMs + duration * 60 * 1000,
+        });
+      }
+    }
+
+    return [
+      ...singles,
+      ...Array.from(groupTotals.values()).map((group) => ({
+        startMs: group.startMs,
+        endMs: group.startMs + group.totalDuration * 60 * 1000,
+      })),
+    ];
+  }
+
+  private async resolveBookingPricing(
+    businessService: BusinessServiceEntity,
+    serviceClassId: string | null,
+  ): Promise<{ serviceClassId: string | null; durationMinutes: number }> {
+    const business = await this.businessRepo.findOne({
+      where: { id: businessService.businessId },
     });
+    const activeClassCount = await this.serviceClassRepo.count({
+      where: { businessId: businessService.businessId, isActive: true },
+    });
+
+    const usesClasses =
+      business?.serviceClassesEnabled === true && activeClassCount > 0;
+
+    if (!usesClasses) {
+      if (serviceClassId) {
+        throw new BadRequestException(
+          'This business does not use service classes',
+        );
+      }
+      return {
+        serviceClassId: null,
+        durationMinutes: resolveServiceDurationMinutes(
+          businessService.durationMinutes,
+          businessService.serviceTemplate?.defaultDurationMinutes,
+        ),
+      };
+    }
+
+    if (!serviceClassId) {
+      throw new BadRequestException('serviceClassId is required for this business');
+    }
+
+    const serviceClass = await this.serviceClassRepo.findOne({
+      where: {
+        id: serviceClassId,
+        businessId: businessService.businessId,
+        isActive: true,
+      },
+    });
+    if (!serviceClass) {
+      throw new BadRequestException('Service class not found or inactive');
+    }
+
+    const classPrice = await this.classPriceRepo.findOne({
+      where: {
+        businessServiceId: businessService.id,
+        classId: serviceClassId,
+        isActive: true,
+      },
+    });
+    if (!classPrice) {
+      throw new BadRequestException(
+        'This service is not available for the selected class',
+      );
+    }
+
+    return {
+      serviceClassId,
+      durationMinutes: resolveServiceDurationMinutes(
+        classPrice.durationMinutes ?? businessService.durationMinutes,
+        businessService.serviceTemplate?.defaultDurationMinutes,
+      ),
+    };
+  }
+
+  private async resolveGroupDuration(booking: BookingEntity): Promise<number> {
+    if (!booking.bookingGroupId) {
+      return this.resolveBookingDuration(booking);
+    }
+
+    const siblings = await this.repo.find({
+      where: {
+        bookingGroupId: booking.bookingGroupId,
+        status: In([BookingStatus.PENDING, BookingStatus.CONFIRMED]),
+      },
+      relations: { businessService: { serviceTemplate: true } },
+    });
+
+    const rows = siblings.length
+      ? siblings
+      : [
+          {
+            ...booking,
+            businessService:
+              booking.businessService ??
+              (await this.businessServiceRepo.findOne({
+                where: { id: booking.businessServiceId },
+                relations: { serviceTemplate: true },
+              })),
+          } as BookingEntity,
+        ];
+
+    let total = 0;
+    for (const row of rows) {
+      total += await this.resolveBookingDuration(row);
+    }
+    return total;
+  }
+
+  private async resolveBookingDuration(booking: BookingEntity): Promise<number> {
+    if (!booking.businessService) {
+      const businessService = await this.businessServiceRepo.findOne({
+        where: { id: booking.businessServiceId },
+        relations: { serviceTemplate: true },
+      });
+      if (!businessService) {
+        return 30;
+      }
+      booking.businessService = businessService;
+    }
+
+    if (booking.serviceClassId) {
+      const classPrice = await this.classPriceRepo.findOne({
+        where: {
+          businessServiceId: booking.businessServiceId,
+          classId: booking.serviceClassId,
+        },
+      });
+      return resolveServiceDurationMinutes(
+        classPrice?.durationMinutes ?? booking.businessService.durationMinutes,
+        booking.businessService.serviceTemplate?.defaultDurationMinutes,
+      );
+    }
+
+    return resolveServiceDurationMinutes(
+      booking.businessService.durationMinutes,
+      booking.businessService.serviceTemplate?.defaultDurationMinutes,
+    );
   }
 
   private async assertSchedulableSlot(params: {
     businessId: string;
-    businessServiceId: string;
     scheduledAt: Date;
     durationMinutes: number;
     excludeBookingId?: string;
+    excludeBookingGroupId?: string;
   }): Promise<void> {
-    const { businessId, scheduledAt, durationMinutes, excludeBookingId } =
-      params;
+    const {
+      businessId,
+      scheduledAt,
+      durationMinutes,
+      excludeBookingId,
+      excludeBookingGroupId,
+    } = params;
 
     this.assertLeadTime(scheduledAt);
 
@@ -355,11 +653,10 @@ export class BookingsService {
       leadMinutes: this.minLeadMinutes,
       slotStepMinutes: 15,
       windows,
-      busy: await this.loadBusyIntervals(
-        businessId,
-        dateYmd,
+      busy: await this.loadBusyIntervals(businessId, dateYmd, {
         excludeBookingId,
-      ),
+        excludeBookingGroupId,
+      }),
     });
 
     const scheduledMs = scheduledAt.getTime();
diff --git a/src/modules/bookings/dto/create-booking-batch.dto.ts b/src/modules/bookings/dto/create-booking-batch.dto.ts
new file mode 100644
index 0000000..c4a892d
--- /dev/null
+++ b/src/modules/bookings/dto/create-booking-batch.dto.ts
@@ -0,0 +1,50 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { Type } from 'class-transformer';
+import {
+  ArrayMinSize,
+  IsArray,
+  IsISO8601,
+  IsOptional,
+  IsString,
+  IsUUID,
+  MaxLength,
+  ValidateNested,
+} from 'class-validator';
+
+export class CreateBookingBatchItemDto {
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
+  businessServiceId!: string;
+}
+
+export class CreateBookingBatchDto {
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
+  customerId!: string;
+
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
+  businessId!: string;
+
+  @ApiProperty({ type: [CreateBookingBatchItemDto], minItems: 1 })
+  @IsArray()
+  @ArrayMinSize(1)
+  @ValidateNested({ each: true })
+  @Type(() => CreateBookingBatchItemDto)
+  items!: CreateBookingBatchItemDto[];
+
+  @ApiProperty({ example: '2026-05-13T10:00:00.000Z' })
+  @IsISO8601()
+  scheduledAt!: string;
+
+  @ApiPropertyOptional({ format: 'uuid', nullable: true })
+  @IsOptional()
+  @IsUUID()
+  serviceClassId?: string | null;
+
+  @ApiPropertyOptional({ nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
+  note?: string | null;
+}
diff --git a/src/modules/bookings/dto/create-booking.dto.ts b/src/modules/bookings/dto/create-booking.dto.ts
index b59a9ab..12de7fc 100644
--- a/src/modules/bookings/dto/create-booking.dto.ts
+++ b/src/modules/bookings/dto/create-booking.dto.ts
@@ -14,6 +14,11 @@ export class CreateBookingDto {
   @IsUUID()
   businessServiceId!: string;
 
+  @ApiPropertyOptional({ format: 'uuid', nullable: true })
+  @IsOptional()
+  @IsUUID()
+  serviceClassId?: string | null;
+
   /** ISO 8601 datetime string */
   @ApiProperty({ example: '2026-05-13T10:00:00.000Z' })
   @IsISO8601()
diff --git a/src/modules/business-service-classes/business-service-classes.controller.ts b/src/modules/business-service-classes/business-service-classes.controller.ts
new file mode 100644
index 0000000..b015a2b
--- /dev/null
+++ b/src/modules/business-service-classes/business-service-classes.controller.ts
@@ -0,0 +1,74 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  Param,
+  Patch,
+  Post,
+  Query,
+  UseGuards,
+} from '@nestjs/common';
+import { BusinessServiceClassEntity } from '../../entities/business-service-class.entity';
+import { UserRole } from '../../entities/user.entity';
+import { AuthUser } from '../auth/auth.types';
+import { CurrentUser } from '../auth/decorators/current-user.decorator';
+import { Roles } from '../auth/decorators/roles.decorator';
+import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
+import { RolesGuard } from '../auth/guards/roles.guard';
+import { BusinessServiceClassesService } from './business-service-classes.service';
+import { CreateBusinessServiceClassDto } from './dto/create-business-service-class.dto';
+import { UpdateBusinessServiceClassDto } from './dto/update-business-service-class.dto';
+
+@Controller('business-service-classes')
+export class BusinessServiceClassesController {
+  constructor(private readonly service: BusinessServiceClassesService) {}
+
+  @Get()
+  findAll(
+    @Query('businessId') businessId?: string,
+    @Query('isActive') isActive?: string,
+  ): Promise<BusinessServiceClassEntity[]> {
+    const parsedIsActive =
+      typeof isActive === 'string' ? isActive === 'true' : undefined;
+
+    return this.service.findAll({ businessId, isActive: parsedIsActive });
+  }
+
+  @Get(':id')
+  findOne(@Param('id') id: string): Promise<BusinessServiceClassEntity> {
+    return this.service.findOne(id);
+  }
+
+  @Post()
+  @UseGuards(JwtAuthGuard, RolesGuard)
+  @Roles(UserRole.ADMIN, UserRole.BUSINESS_OWNER)
+  create(
+    @Body() payload: CreateBusinessServiceClassDto,
+    @CurrentUser() user: AuthUser,
+  ): Promise<BusinessServiceClassEntity> {
+    return this.service.create(payload, user);
+  }
+
+  @Patch(':id')
+  @UseGuards(JwtAuthGuard, RolesGuard)
+  @Roles(UserRole.ADMIN, UserRole.BUSINESS_OWNER)
+  update(
+    @Param('id') id: string,
+    @Body() payload: UpdateBusinessServiceClassDto,
+    @CurrentUser() user: AuthUser,
+  ): Promise<BusinessServiceClassEntity> {
+    return this.service.update(id, payload, user);
+  }
+
+  @Delete(':id')
+  @UseGuards(JwtAuthGuard, RolesGuard)
+  @Roles(UserRole.ADMIN, UserRole.BUSINESS_OWNER)
+  async remove(
+    @Param('id') id: string,
+    @CurrentUser() user: AuthUser,
+  ): Promise<{ success: true }> {
+    await this.service.remove(id, user);
+    return { success: true };
+  }
+}
diff --git a/src/modules/business-service-classes/business-service-classes.module.ts b/src/modules/business-service-classes/business-service-classes.module.ts
new file mode 100644
index 0000000..d6aa383
--- /dev/null
+++ b/src/modules/business-service-classes/business-service-classes.module.ts
@@ -0,0 +1,18 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { BusinessEntity } from '../../entities/business.entity';
+import { BusinessServiceClassEntity } from '../../entities/business-service-class.entity';
+import { AuthModule } from '../auth/auth.module';
+import { BusinessServiceClassesController } from './business-service-classes.controller';
+import { BusinessServiceClassesService } from './business-service-classes.service';
+
+@Module({
+  imports: [
+    TypeOrmModule.forFeature([BusinessServiceClassEntity, BusinessEntity]),
+    AuthModule,
+  ],
+  controllers: [BusinessServiceClassesController],
+  providers: [BusinessServiceClassesService],
+  exports: [BusinessServiceClassesService],
+})
+export class BusinessServiceClassesModule {}
diff --git a/src/modules/business-service-classes/business-service-classes.service.ts b/src/modules/business-service-classes/business-service-classes.service.ts
new file mode 100644
index 0000000..5660836
--- /dev/null
+++ b/src/modules/business-service-classes/business-service-classes.service.ts
@@ -0,0 +1,168 @@
+import {
+  BadRequestException,
+  ConflictException,
+  ForbiddenException,
+  Injectable,
+  NotFoundException,
+} from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { BusinessEntity } from '../../entities/business.entity';
+import { BusinessServiceClassEntity } from '../../entities/business-service-class.entity';
+import { UserRole } from '../../entities/user.entity';
+import { AuthUser } from '../auth/auth.types';
+import { CreateBusinessServiceClassDto } from './dto/create-business-service-class.dto';
+import { UpdateBusinessServiceClassDto } from './dto/update-business-service-class.dto';
+
+type FindAllFilters = {
+  businessId?: string;
+  isActive?: boolean;
+};
+
+@Injectable()
+export class BusinessServiceClassesService {
+  constructor(
+    @InjectRepository(BusinessServiceClassEntity)
+    private readonly repo: Repository<BusinessServiceClassEntity>,
+    @InjectRepository(BusinessEntity)
+    private readonly businessRepo: Repository<BusinessEntity>,
+  ) {}
+
+  async findAll(filters: FindAllFilters): Promise<BusinessServiceClassEntity[]> {
+    const query = this.repo
+      .createQueryBuilder('c')
+      .orderBy('c.sortOrder', 'ASC')
+      .addOrderBy('c.createdAt', 'ASC');
+
+    if (filters.businessId) {
+      query.andWhere('c.businessId = :businessId', {
+        businessId: filters.businessId,
+      });
+    }
+    if (typeof filters.isActive === 'boolean') {
+      query.andWhere('c.isActive = :isActive', { isActive: filters.isActive });
+    }
+
+    return query.getMany();
+  }
+
+  async findOne(id: string): Promise<BusinessServiceClassEntity> {
+    const row = await this.repo.findOne({ where: { id } });
+    if (!row) {
+      throw new NotFoundException('Service class not found');
+    }
+    return row;
+  }
+
+  async create(
+    dto: CreateBusinessServiceClassDto,
+    actor?: AuthUser,
+  ): Promise<BusinessServiceClassEntity> {
+    const business = await this.businessRepo.findOne({
+      where: { id: dto.businessId },
+    });
+    if (!business) {
+      throw new NotFoundException('Business not found');
+    }
+    this.assertCanManageBusiness(business, actor);
+
+    const dup = await this.repo.findOne({
+      where: { businessId: dto.businessId, title: dto.title.trim() },
+    });
+    if (dup) {
+      throw new ConflictException('A class with this title already exists');
+    }
+
+    let sortOrder = dto.sortOrder;
+    if (sortOrder === undefined) {
+      const max = await this.repo
+        .createQueryBuilder('c')
+        .select('MAX(c.sortOrder)', 'max')
+        .where('c.businessId = :businessId', { businessId: dto.businessId })
+        .getRawOne<{ max: string | null }>();
+      sortOrder = (max?.max ? Number.parseInt(max.max, 10) : -1) + 1;
+    }
+
+    const entity = this.repo.create({
+      businessId: dto.businessId,
+      title: dto.title.trim(),
+      description: dto.description?.trim() || null,
+      sortOrder,
+      isActive: dto.isActive ?? true,
+    });
+
+    return this.repo.save(entity);
+  }
+
+  async update(
+    id: string,
+    dto: UpdateBusinessServiceClassDto,
+    actor?: AuthUser,
+  ): Promise<BusinessServiceClassEntity> {
+    const row = await this.findOne(id);
+    const business = await this.businessRepo.findOne({
+      where: { id: row.businessId },
+    });
+    if (!business) {
+      throw new NotFoundException('Business not found');
+    }
+    this.assertCanManageBusiness(business, actor);
+
+    if (dto.title !== undefined) {
+      const title = dto.title.trim();
+      if (!title) {
+        throw new BadRequestException('title cannot be empty');
+      }
+      const dup = await this.repo.findOne({
+        where: { businessId: row.businessId, title },
+      });
+      if (dup && dup.id !== row.id) {
+        throw new ConflictException('A class with this title already exists');
+      }
+      row.title = title;
+    }
+    if (dto.description !== undefined) {
+      row.description = dto.description?.trim() || null;
+    }
+    if (dto.sortOrder !== undefined) {
+      row.sortOrder = dto.sortOrder;
+    }
+    if (dto.isActive !== undefined) {
+      row.isActive = dto.isActive;
+    }
+
+    return this.repo.save(row);
+  }
+
+  async remove(id: string, actor?: AuthUser): Promise<void> {
+    const row = await this.findOne(id);
+    const business = await this.businessRepo.findOne({
+      where: { id: row.businessId },
+    });
+    if (!business) {
+      throw new NotFoundException('Business not found');
+    }
+    this.assertCanManageBusiness(business, actor);
+
+    const result = await this.repo.delete(id);
+    if (!result.affected) {
+      throw new NotFoundException('Service class not found');
+    }
+  }
+
+  private assertCanManageBusiness(
+    business: BusinessEntity,
+    actor?: AuthUser,
+  ): void {
+    if (!actor || actor.role === UserRole.ADMIN) {
+      return;
+    }
+
+    if (
+      actor.role !== UserRole.BUSINESS_OWNER ||
+      business.ownerId !== actor.id
+    ) {
+      throw new ForbiddenException('You can only manage your own business');
+    }
+  }
+}
diff --git a/src/modules/business-service-classes/dto/create-business-service-class.dto.ts b/src/modules/business-service-classes/dto/create-business-service-class.dto.ts
new file mode 100644
index 0000000..72ad800
--- /dev/null
+++ b/src/modules/business-service-classes/dto/create-business-service-class.dto.ts
@@ -0,0 +1,30 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsBoolean, IsInt, IsOptional, IsString, IsUUID, MaxLength, Min } from 'class-validator';
+
+export class CreateBusinessServiceClassDto {
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
+  businessId!: string;
+
+  @ApiProperty({ example: 'کلاس ۱ — مینی و کوچک' })
+  @IsString()
+  @MaxLength(120)
+  title!: string;
+
+  @ApiPropertyOptional({ nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
+  description?: string | null;
+
+  @ApiPropertyOptional({ default: 0 })
+  @IsOptional()
+  @IsInt()
+  @Min(0)
+  sortOrder?: number;
+
+  @ApiPropertyOptional({ default: true })
+  @IsOptional()
+  @IsBoolean()
+  isActive?: boolean;
+}
diff --git a/src/modules/business-service-classes/dto/update-business-service-class.dto.ts b/src/modules/business-service-classes/dto/update-business-service-class.dto.ts
new file mode 100644
index 0000000..7b047f7
--- /dev/null
+++ b/src/modules/business-service-classes/dto/update-business-service-class.dto.ts
@@ -0,0 +1,27 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsBoolean, IsInt, IsOptional, IsString, MaxLength, Min } from 'class-validator';
+
+export class UpdateBusinessServiceClassDto {
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  @MaxLength(120)
+  title?: string;
+
+  @ApiPropertyOptional({ nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
+  description?: string | null;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsInt()
+  @Min(0)
+  sortOrder?: number;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsBoolean()
+  isActive?: boolean;
+}
diff --git a/src/modules/business-services/business-services.controller.ts b/src/modules/business-services/business-services.controller.ts
index e70004d..c77380d 100644
--- a/src/modules/business-services/business-services.controller.ts
+++ b/src/modules/business-services/business-services.controller.ts
@@ -6,6 +6,7 @@ import {
   Param,
   Patch,
   Post,
+  Put,
   Query,
   UseGuards,
 } from '@nestjs/common';
@@ -19,6 +20,7 @@ import { RolesGuard } from '../auth/guards/roles.guard';
 import { BusinessServicesService } from './business-services.service';
 import { CreateBusinessServiceDto } from './dto/create-business-service.dto';
 import { UpdateBusinessServiceDto } from './dto/update-business-service.dto';
+import { SetBusinessServiceClassPricesDto } from './dto/set-business-service-class-prices.dto';
 
 @Controller('business-services')
 export class BusinessServicesController {
@@ -66,6 +68,17 @@ export class BusinessServicesController {
     return this.service.update(id, payload, user);
   }
 
+  @Put(':id/class-prices')
+  @UseGuards(JwtAuthGuard, RolesGuard)
+  @Roles(UserRole.ADMIN, UserRole.BUSINESS_OWNER)
+  setClassPrices(
+    @Param('id') id: string,
+    @Body() payload: SetBusinessServiceClassPricesDto,
+    @CurrentUser() user: AuthUser,
+  ): Promise<BusinessServiceEntity> {
+    return this.service.setClassPrices(id, payload, user);
+  }
+
   @Delete(':id')
   @UseGuards(JwtAuthGuard, RolesGuard)
   @Roles(UserRole.ADMIN, UserRole.BUSINESS_OWNER)
diff --git a/src/modules/business-services/business-services.module.ts b/src/modules/business-services/business-services.module.ts
index 63e8809..a884cce 100644
--- a/src/modules/business-services/business-services.module.ts
+++ b/src/modules/business-services/business-services.module.ts
@@ -2,6 +2,8 @@ import { Module } from '@nestjs/common';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { BusinessEntity } from '../../entities/business.entity';
 import { BusinessServiceEntity } from '../../entities/business-service.entity';
+import { BusinessServiceClassEntity } from '../../entities/business-service-class.entity';
+import { BusinessServiceClassPriceEntity } from '../../entities/business-service-class-price.entity';
 import { ServiceTemplateEntity } from '../../entities/service-template.entity';
 import { AuthModule } from '../auth/auth.module';
 import { BusinessServicesController } from './business-services.controller';
@@ -13,6 +15,8 @@ import { BusinessServicesService } from './business-services.service';
       BusinessServiceEntity,
       BusinessEntity,
       ServiceTemplateEntity,
+      BusinessServiceClassEntity,
+      BusinessServiceClassPriceEntity,
     ]),
     AuthModule,
   ],
diff --git a/src/modules/business-services/business-services.service.ts b/src/modules/business-services/business-services.service.ts
index 29b2e59..0689f8d 100644
--- a/src/modules/business-services/business-services.service.ts
+++ b/src/modules/business-services/business-services.service.ts
@@ -6,14 +6,17 @@ import {
   NotFoundException,
 } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
-import { Repository } from 'typeorm';
+import { In, Repository } from 'typeorm';
 import { BusinessEntity } from '../../entities/business.entity';
 import { BusinessServiceEntity } from '../../entities/business-service.entity';
+import { BusinessServiceClassEntity } from '../../entities/business-service-class.entity';
+import { BusinessServiceClassPriceEntity } from '../../entities/business-service-class-price.entity';
 import { ServiceTemplateEntity } from '../../entities/service-template.entity';
 import { UserRole } from '../../entities/user.entity';
 import { AuthUser } from '../auth/auth.types';
 import { CreateBusinessServiceDto } from './dto/create-business-service.dto';
 import { UpdateBusinessServiceDto } from './dto/update-business-service.dto';
+import { SetBusinessServiceClassPricesDto } from './dto/set-business-service-class-prices.dto';
 
 type FindAllFilters = {
   businessId?: string;
@@ -37,6 +40,10 @@ export class BusinessServicesService {
     private readonly businessRepo: Repository<BusinessEntity>,
     @InjectRepository(ServiceTemplateEntity)
     private readonly templateRepo: Repository<ServiceTemplateEntity>,
+    @InjectRepository(BusinessServiceClassEntity)
+    private readonly classRepo: Repository<BusinessServiceClassEntity>,
+    @InjectRepository(BusinessServiceClassPriceEntity)
+    private readonly classPriceRepo: Repository<BusinessServiceClassPriceEntity>,
   ) {}
 
   async findAll(filters: FindAllFilters): Promise<BusinessServiceEntity[]> {
@@ -44,6 +51,8 @@ export class BusinessServicesService {
       .createQueryBuilder('bs')
       .leftJoinAndSelect('bs.business', 'business')
       .leftJoinAndSelect('bs.serviceTemplate', 'template')
+      .leftJoinAndSelect('bs.classPrices', 'classPrices')
+      .leftJoinAndSelect('classPrices.serviceClass', 'serviceClass')
       .orderBy('bs.createdAt', 'DESC');
 
     if (filters.businessId) {
@@ -68,7 +77,11 @@ export class BusinessServicesService {
   async findOne(id: string): Promise<BusinessServiceEntity> {
     const row = await this.repo.findOne({
       where: { id },
-      relations: { business: true, serviceTemplate: true },
+      relations: {
+        business: true,
+        serviceTemplate: true,
+        classPrices: { serviceClass: true },
+      },
     });
     if (!row) {
       throw new NotFoundException('Business service not found');
@@ -193,6 +206,67 @@ export class BusinessServicesService {
     return this.repo.save(row);
   }
 
+  async setClassPrices(
+    id: string,
+    dto: SetBusinessServiceClassPricesDto,
+    actor?: AuthUser,
+  ): Promise<BusinessServiceEntity> {
+    const row = await this.findOne(id);
+    const business = await this.businessRepo.findOne({
+      where: { id: row.businessId },
+    });
+    if (!business) {
+      throw new NotFoundException('Business not found');
+    }
+    this.assertCanManageBusiness(business, actor);
+
+    const classIds = [...new Set(dto.prices.map((p) => p.classId))];
+    const classes = await this.classRepo.find({
+      where: { businessId: row.businessId, id: In(classIds) },
+    });
+    if (classes.length !== classIds.length) {
+      throw new BadRequestException(
+        'One or more service classes do not belong to this business',
+      );
+    }
+
+    for (const item of dto.prices) {
+      const existing = await this.classPriceRepo.findOne({
+        where: { businessServiceId: id, classId: item.classId },
+      });
+      const payload = {
+        price: normalizePrice(item.price),
+        durationMinutes: item.durationMinutes ?? null,
+        isActive: item.isActive ?? true,
+      };
+      if (existing) {
+        Object.assign(existing, payload);
+        await this.classPriceRepo.save(existing);
+      } else {
+        await this.classPriceRepo.save(
+          this.classPriceRepo.create({
+            businessServiceId: id,
+            classId: item.classId,
+            ...payload,
+          }),
+        );
+      }
+    }
+
+    const activePrices = await this.classPriceRepo.find({
+      where: { businessServiceId: id, isActive: true },
+    });
+    if (activePrices.length) {
+      const minPrice = activePrices.reduce((min, p) =>
+        Number.parseFloat(p.price) < Number.parseFloat(min.price) ? p : min,
+      );
+      row.price = minPrice.price;
+      await this.repo.save(row);
+    }
+
+    return this.findOne(id);
+  }
+
   async remove(id: string, actor?: AuthUser): Promise<void> {
     const row = await this.findOne(id);
     const business = await this.businessRepo.findOne({
diff --git a/src/modules/business-services/dto/set-business-service-class-prices.dto.ts b/src/modules/business-services/dto/set-business-service-class-prices.dto.ts
new file mode 100644
index 0000000..065811b
--- /dev/null
+++ b/src/modules/business-services/dto/set-business-service-class-prices.dto.ts
@@ -0,0 +1,44 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { Type } from 'class-transformer';
+import {
+  ArrayMinSize,
+  IsArray,
+  IsBoolean,
+  IsInt,
+  IsNumber,
+  IsOptional,
+  IsUUID,
+  Min,
+  ValidateNested,
+} from 'class-validator';
+
+export class BusinessServiceClassPriceItemDto {
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
+  classId!: string;
+
+  @ApiProperty({ example: 100000 })
+  @IsNumber()
+  @Min(0)
+  price!: number;
+
+  @ApiPropertyOptional({ nullable: true })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  durationMinutes?: number | null;
+
+  @ApiPropertyOptional({ default: true })
+  @IsOptional()
+  @IsBoolean()
+  isActive?: boolean;
+}
+
+export class SetBusinessServiceClassPricesDto {
+  @ApiProperty({ type: [BusinessServiceClassPriceItemDto] })
+  @IsArray()
+  @ArrayMinSize(1)
+  @ValidateNested({ each: true })
+  @Type(() => BusinessServiceClassPriceItemDto)
+  prices!: BusinessServiceClassPriceItemDto[];
+}
diff --git a/src/modules/businesses/dto/update-business.dto.ts b/src/modules/businesses/dto/update-business.dto.ts
index 2063b7a..436d698 100644
--- a/src/modules/businesses/dto/update-business.dto.ts
+++ b/src/modules/businesses/dto/update-business.dto.ts
@@ -68,4 +68,12 @@ export class UpdateBusinessDto {
   @IsOptional()
   @IsBoolean()
   isActive?: boolean;
+
+  @ApiPropertyOptional({
+    example: false,
+    description: 'When true, services are priced per owner-defined class (e.g. car size)',
+  })
+  @IsOptional()
+  @IsBoolean()
+  serviceClassesEnabled?: boolean;
 }